Determining dominant gradient orientation in image processing using double-angle gradients
AssigneeImagination Technologies Limited
InventorRuan Lakemond
Life of this patent
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Abstract
Methods and image processing systems are provided for determining a dominant gradient orientation for a target region within an image. A plurality of gradient samples are determined for the target region, wherein each of the gradient samples represents a variation in pixel values within the target region. The gradient samples are converted into double-angle gradient vectors, and the double-angle gradient vectors are combined so as to determine a dominant gradient orientation for the target region.
Claims20
A method of determining a dominant gradient orientation for a target region within an image, the method comprising:
- converting gradient samples for the target region into double-angle gradient vectors;
- combining the double-angle gradient vectors to determine a compound gradient vector for the target region;
- and
- converting the compound gradient vector to a dominant gradient vector, the dominant gradient vector representing the dominant gradient orientation for the target region.
An image processing system configured to determine a dominant gradient orientation for a target region within an image, the image processing system comprising:
- a conversion unit configured to convert gradient samples for the target region into double-angle gradient vectors;
- a combining unit configured to combine the double-angle gradient vectors to determine a compound gradient vector for the target region;
- and
- a determining unit configured to convert the compound gradient vector to a dominant gradient vector, the dominant gradient vector representing the dominant gradient orientation for the target region.
A non-transitory computer readable storage medium having stored thereon computer readable instructions that, when executed at a computer system, cause the computer system to perform a method of determining a dominant gradient orientation for a target region within an image, the method comprising:
- converting gradient samples for the target region into double-angle gradient vectors;
- combining the double-angle gradient vectors to determine a compound gradient vector for the target region;
- and
- converting the compound gradient vector to a dominant gradient vector, the dominant gradient vector representing the dominant gradient orientation for the target region.
Dependencies are inferred from the claim text.